The Dracula Killer, by Lt. Ray Biondi and Walt Hecox. New York: Pocket, 1992.

Whoever Fights Monsters, by Robert Ressler. New York: St. Martin’s Press, 1992.

The Encyclopedia of Serial Killers, by Brian Lane and Wilfred Gregg. New York: Berkeley, 1995.

The A to Z Encyclopedia of Serial Killers, by Harold Schecter and David Everitt. New York: Pocket, 1996.